Hydro-pneumatic damping device

US4287970A · kind A · utility

Assignee

• Fichtel & Sachs · DE

Inventors

• Robert Eusemann · Bergrheinfeld, DE
• Gunther Handke · Euerbach, DE
• Manfred Koller · Obbach, DE

Key dates

• Filing date: Jan 25, 1980
• Grant date: Sep 8, 1981
• Expiry date: Jan 25, 2000

Classification

• Technology area (CPC F): Mechanical Engineering; Lighting; Heating
• CPC primary: F16F9/364
• WIPO field: Mechanical elements
• WIPO sector: Mechanical engineering

Abstract

A hydro-pneumatic damping device particularly for spring legs of automotive vehicles comprises an inner cylinder, an outer container, a central cavity within the inner cylinder, an annular cavity between the inner cylinder and the outer container, a piston rod with a piston unit, venting passage means between the central cavity and the annular cavity extending across a cylinder closing unit and check valve means associated to said venting passage means. The check valve means comprise an annular check valve member in frictional sliding engagement with the piston rod for axial movement with the piston rod toward a sealing position during inward movement of the piston rod and toward an opening position during outward movement of the piston rod, first and second abutment means being provided for defining said sealing position and said opening position of said annular check valve member respectively.